The Potters were caught out twice against Wolves.
Defender Faye said: "I am disappointed with the result. Last year we scored from many set pieces but now we have a problem.
"I need to work hard at them - it is important.
"Our ambition is still to finish in the top ten."
Faye could have won the match but aimed a late free header over the bar. He said: "Normally I'd have scored but I couldn't see the ball in the light."